疲劳荷载作用下植筋混凝土梁构造优化研究  

RESEARCH ON STRUCTURAL OPTIMIZATION OF ANCHORAGE BEAM UNDER FATIGUE LOAD

作　　者：阎西康 梁琳霄 温国强 庞玉松 YAN Xikang LIANG Linxiao WEN Guoqiang PANG Yusong(School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China)

机构地区：[1]河北工业大学土木与交通学院,天津300401

出　　处：《工业建筑》2017年第9期158-163,180,共7页Industrial Construction

基　　金：河北省建设科学技术研究计划(2014-124)

摘　　要：已有研究发现植筋混凝土梁疲劳破坏时存在植筋端头处产生受剪斜裂缝,导致脆性破坏的问题,针对此问题提出了在植筋端头设置箍筋这一构造优化措施。通过试验和数值模拟分析了7组不同植筋深度下构造改良前后植筋梁的极限承载力、挠度、植筋应变等力学性能。结果表明:在植筋混凝土梁的植筋端头设立箍筋可以有效提高植筋混凝土梁的极限承载力和极限变形能力。在保证原设计承载力和延性的基础上,实际施工中可以适当减小(2~3)d(d为植筋直径)的植筋深度使植筋端头位于原有构件箍筋处,从而减少植筋端头剪应力的产生,防止脆性破坏。Brittle failure may occur on anchorage beam under fatigue load because of shear cracks near the end of anchorage-bar section. The paper put forward the structural optimization measure that setting stirrup at the end of postinstalled rebar. 7 groups mechanical properties of anchorage beam before and after optimization were analyzed from the aspects of anchorage beams with different planted depth were analyzed through experiments and numerical simulation. The ultimate bearing capacity,deflection,strain of post-installed rebar and so on. The results showed that setting stirrup at end of anchorage bar could improve the ultimate bearing capacity and deformability effectively. In actual construction,ensuring the original design bearing capacity and ductility in the original basis,decreasing（ 2 - 3） d to locate the end of anchorage bar at stirrup of original structure to reduce the shear stress and prevent brittle failure is feasible.

关 键 词：植筋 构造优化 疲劳破坏 植筋深度 

分 类 号：TU37[建筑科学—结构工程]